package cn.tedu;

import java.sql.*;
import java.util.Scanner;

public class Demo02 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入用户名");
        String username = sc.nextLine();
        System.out.println("请输入密码");
        String password = sc.nextLine();
        //获取连接
        try (Connection conn = DBUtils.getConn()){
//            Statement s = conn.createStatement();
//            ResultSet rs = s.executeQuery(
//                    "select count(*) from user where username='"+
//                    username+"'and password='"+password+"'");
            String sql = "select count(*) from user where username=? and password=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,username);
            ps.setString(2,password);
            ResultSet rs = ps.executeQuery();
            rs.next();//游标往下移动,不管是否登录成功 都需要游标移动
            int count = rs.getInt(1);
            if (count>0){
                System.out.println("登录成功!");
            }else {
                System.out.println("用户名或密码错误!");
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}
